?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
staging: brcm80211: fix thread blocking issue in brcmf_sdbrcm_bus_stop()
[zen-stable.git] / security / selinux / ss / policydb.c
blob2381d0ded228d492a207b2745a6bc59269114316
1 /*
2 * Implementation of the policy database.
3 *
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
5 */
6
7 /*
8 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
9 *
10 * Support for enhanced MLS infrastructure.
11 *
12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
13 *
14 * Added conditional policy language extensions
15 *
16 * Updated: Hewlett-Packard <paul@paul-moore.com>
17 *
18 * Added support for the policy capability bitmap
19 *
20 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
21 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
22 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
23 * This program is free software; you can redistribute it and/or modify
24 * it under the terms of the GNU General Public License as published by
25 * the Free Software Foundation, version 2.
26 */
27
28 #include <linux/kernel.h>
29 #include <linux/sched.h>
30 #include <linux/slab.h>
31 #include <linux/string.h>
32 #include <linux/errno.h>
33 #include <linux/audit.h>
34 #include <linux/flex_array.h>
35 #include "security.h"
36
37 #include "policydb.h"
38 #include "conditional.h"
39 #include "mls.h"
40 #include "services.h"
41
42 #define _DEBUG_HASHES
43
44 #ifdef DEBUG_HASHES
45 static const char *symtab_name[SYM_NUM] = {
46 "common prefixes",
47 "classes",
48 "roles",
49 "types",
50 "users",
51 "bools",
52 "levels",
53 "categories",
54 };
55 #endif
56
57 static unsigned int symtab_sizes[SYM_NUM] = {
58 2,
59 32,
60 16,
61 512,
62 128,
63 16,
64 16,
65 16,
66 };
67
68 struct policydb_compat_info {
69 int version;
70 int sym_num;
71 int ocon_num;
72 };
73
74 /* These need to be updated if SYM_NUM or OCON_NUM changes */
75 static struct policydb_compat_info policydb_compat[] = {
76 {
77 .version = POLICYDB_VERSION_BASE,
78 .sym_num = SYM_NUM - 3,
79 .ocon_num = OCON_NUM - 1,
80 },
81 {
82 .version = POLICYDB_VERSION_BOOL,
83 .sym_num = SYM_NUM - 2,
84 .ocon_num = OCON_NUM - 1,
85 },
86 {
87 .version = POLICYDB_VERSION_IPV6,
88 .sym_num = SYM_NUM - 2,
89 .ocon_num = OCON_NUM,
90 },
91 {
92 .version = POLICYDB_VERSION_NLCLASS,
93 .sym_num = SYM_NUM - 2,
94 .ocon_num = OCON_NUM,
95 },
96 {
97 .version = POLICYDB_VERSION_MLS,
98 .sym_num = SYM_NUM,
99 .ocon_num = OCON_NUM,
100 },
101 {
102 .version = POLICYDB_VERSION_AVTAB,
103 .sym_num = SYM_NUM,
104 .ocon_num = OCON_NUM,
105 },
106 {
107 .version = POLICYDB_VERSION_RANGETRANS,
108 .sym_num = SYM_NUM,
109 .ocon_num = OCON_NUM,
110 },
111 {
112 .version = POLICYDB_VERSION_POLCAP,
113 .sym_num = SYM_NUM,
114 .ocon_num = OCON_NUM,
115 },
116 {
117 .version = POLICYDB_VERSION_PERMISSIVE,
118 .sym_num = SYM_NUM,
119 .ocon_num = OCON_NUM,
120 },
121 {
122 .version = POLICYDB_VERSION_BOUNDARY,
123 .sym_num = SYM_NUM,
124 .ocon_num = OCON_NUM,
125 },
126 {
127 .version = POLICYDB_VERSION_FILENAME_TRANS,
128 .sym_num = SYM_NUM,
129 .ocon_num = OCON_NUM,
130 },
131 {
132 .version = POLICYDB_VERSION_ROLETRANS,
133 .sym_num = SYM_NUM,
134 .ocon_num = OCON_NUM,
135 },
136 };
137
138 static struct policydb_compat_info *policydb_lookup_compat(int version)
139 {
140 int i;
141 struct policydb_compat_info *info = NULL;
142
143 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
144 if (policydb_compat[i].version == version) {
145 info = &policydb_compat[i];
146 break;
147 }
148 }
149 return info;
150 }
151
152 /*
153 * Initialize the role table.
154 */
155 static int roles_init(struct policydb *p)
156 {
157 char *key = NULL;
158 int rc;
159 struct role_datum *role;
160
161 rc = -ENOMEM;
162 role = kzalloc(sizeof(*role), GFP_KERNEL);
163 if (!role)
164 goto out;
165
166 rc = -EINVAL;
167 role->value = ++p->p_roles.nprim;
168 if (role->value != OBJECT_R_VAL)
169 goto out;
170
171 rc = -ENOMEM;
172 key = kstrdup(OBJECT_R, GFP_KERNEL);
173 if (!key)
174 goto out;
175
176 rc = hashtab_insert(p->p_roles.table, key, role);
177 if (rc)
178 goto out;
179
180 return 0;
181 out:
182 kfree(key);
183 kfree(role);
184 return rc;
185 }
186
187 static u32 filenametr_hash(struct hashtab *h, const void *k)
188 {
189 const struct filename_trans *ft = k;
190 unsigned long hash;
191 unsigned int byte_num;
192 unsigned char focus;
193
194 hash = ft->stype ^ ft->ttype ^ ft->tclass;
195
196 byte_num = 0;
197 while ((focus = ft->name[byte_num++]))
198 hash = partial_name_hash(focus, hash);
199 return hash & (h->size - 1);
200 }
201
202 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
203 {
204 const struct filename_trans *ft1 = k1;
205 const struct filename_trans *ft2 = k2;
206 int v;
207
208 v = ft1->stype - ft2->stype;
209 if (v)
210 return v;
211
212 v = ft1->ttype - ft2->ttype;
213 if (v)
214 return v;
215
216 v = ft1->tclass - ft2->tclass;
217 if (v)
218 return v;
219
220 return strcmp(ft1->name, ft2->name);
221
222 }
223
224 static u32 rangetr_hash(struct hashtab *h, const void *k)
225 {
226 const struct range_trans *key = k;
227 return (key->source_type + (key->target_type << 3) +
228 (key->target_class << 5)) & (h->size - 1);
229 }
230
231 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
232 {
233 const struct range_trans *key1 = k1, *key2 = k2;
234 int v;
235
236 v = key1->source_type - key2->source_type;
237 if (v)
238 return v;
239
240 v = key1->target_type - key2->target_type;
241 if (v)
242 return v;
243
244 v = key1->target_class - key2->target_class;
245
246 return v;
247 }
248
249 /*
250 * Initialize a policy database structure.
251 */
252 static int policydb_init(struct policydb *p)
253 {
254 int i, rc;
255
256 memset(p, 0, sizeof(*p));
257
258 for (i = 0; i < SYM_NUM; i++) {
259 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
260 if (rc)
261 goto out;
262 }
263
264 rc = avtab_init(&p->te_avtab);
265 if (rc)
266 goto out;
267
268 rc = roles_init(p);
269 if (rc)
270 goto out;
271
272 rc = cond_policydb_init(p);
273 if (rc)
274 goto out;
275
276 p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
277 if (!p->filename_trans)
278 goto out;
279
280 p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
281 if (!p->range_tr)
282 goto out;
283
284 ebitmap_init(&p->filename_trans_ttypes);
285 ebitmap_init(&p->policycaps);
286 ebitmap_init(&p->permissive_map);
287
288 return 0;
289 out:
290 hashtab_destroy(p->filename_trans);
291 hashtab_destroy(p->range_tr);
292 for (i = 0; i < SYM_NUM; i++)
293 hashtab_destroy(p->symtab[i].table);
294 return rc;
295 }
296
297 /*
298 * The following *_index functions are used to
299 * define the val_to_name and val_to_struct arrays
300 * in a policy database structure. The val_to_name
301 * arrays are used when converting security context
302 * structures into string representations. The
303 * val_to_struct arrays are used when the attributes
304 * of a class, role, or user are needed.
305 */
306
307 static int common_index(void *key, void *datum, void *datap)
308 {
309 struct policydb *p;
310 struct common_datum *comdatum;
311 struct flex_array *fa;
312
313 comdatum = datum;
314 p = datap;
315 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
316 return -EINVAL;
317
318 fa = p->sym_val_to_name[SYM_COMMONS];
319 if (flex_array_put_ptr(fa, comdatum->value - 1, key,
320 GFP_KERNEL | __GFP_ZERO))
321 BUG();
322 return 0;
323 }
324
325 static int class_index(void *key, void *datum, void *datap)
326 {
327 struct policydb *p;
328 struct class_datum *cladatum;
329 struct flex_array *fa;
330
331 cladatum = datum;
332 p = datap;
333 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
334 return -EINVAL;
335 fa = p->sym_val_to_name[SYM_CLASSES];
336 if (flex_array_put_ptr(fa, cladatum->value - 1, key,
337 GFP_KERNEL | __GFP_ZERO))
338 BUG();
339 p->class_val_to_struct[cladatum->value - 1] = cladatum;
340 return 0;
341 }
342
343 static int role_index(void *key, void *datum, void *datap)
344 {
345 struct policydb *p;
346 struct role_datum *role;
347 struct flex_array *fa;
348
349 role = datum;
350 p = datap;
351 if (!role->value
352 || role->value > p->p_roles.nprim
353 || role->bounds > p->p_roles.nprim)
354 return -EINVAL;
355
356 fa = p->sym_val_to_name[SYM_ROLES];
357 if (flex_array_put_ptr(fa, role->value - 1, key,
358 GFP_KERNEL | __GFP_ZERO))
359 BUG();
360 p->role_val_to_struct[role->value - 1] = role;
361 return 0;
362 }
363
364 static int type_index(void *key, void *datum, void *datap)
365 {
366 struct policydb *p;
367 struct type_datum *typdatum;
368 struct flex_array *fa;
369
370 typdatum = datum;
371 p = datap;
372
373 if (typdatum->primary) {
374 if (!typdatum->value
375 || typdatum->value > p->p_types.nprim
376 || typdatum->bounds > p->p_types.nprim)
377 return -EINVAL;
378 fa = p->sym_val_to_name[SYM_TYPES];
379 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
380 GFP_KERNEL | __GFP_ZERO))
381 BUG();
382
383 fa = p->type_val_to_struct_array;
384 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
385 GFP_KERNEL | __GFP_ZERO))
386 BUG();
387 }
388
389 return 0;
390 }
391
392 static int user_index(void *key, void *datum, void *datap)
393 {
394 struct policydb *p;
395 struct user_datum *usrdatum;
396 struct flex_array *fa;
397
398 usrdatum = datum;
399 p = datap;
400 if (!usrdatum->value
401 || usrdatum->value > p->p_users.nprim
402 || usrdatum->bounds > p->p_users.nprim)
403 return -EINVAL;
404
405 fa = p->sym_val_to_name[SYM_USERS];
406 if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
407 GFP_KERNEL | __GFP_ZERO))
408 BUG();
409 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
410 return 0;
411 }
412
413 static int sens_index(void *key, void *datum, void *datap)
414 {
415 struct policydb *p;
416 struct level_datum *levdatum;
417 struct flex_array *fa;
418
419 levdatum = datum;
420 p = datap;
421
422 if (!levdatum->isalias) {
423 if (!levdatum->level->sens ||
424 levdatum->level->sens > p->p_levels.nprim)
425 return -EINVAL;
426 fa = p->sym_val_to_name[SYM_LEVELS];
427 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
428 GFP_KERNEL | __GFP_ZERO))
429 BUG();
430 }
431
432 return 0;
433 }
434
435 static int cat_index(void *key, void *datum, void *datap)
436 {
437 struct policydb *p;
438 struct cat_datum *catdatum;
439 struct flex_array *fa;
440
441 catdatum = datum;
442 p = datap;
443
444 if (!catdatum->isalias) {
445 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
446 return -EINVAL;
447 fa = p->sym_val_to_name[SYM_CATS];
448 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
449 GFP_KERNEL | __GFP_ZERO))
450 BUG();
451 }
452
453 return 0;
454 }
455
456 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
457 {
458 common_index,
459 class_index,
460 role_index,
461 type_index,
462 user_index,
463 cond_index_bool,
464 sens_index,
465 cat_index,
466 };
467
468 #ifdef DEBUG_HASHES
469 static void hash_eval(struct hashtab *h, const char *hash_name)
470 {
471 struct hashtab_info info;
472
473 hashtab_stat(h, &info);
474 printk(KERN_DEBUG "SELinux: %s: %d entries and %d/%d buckets used, "
475 "longest chain length %d\n", hash_name, h->nel,
476 info.slots_used, h->size, info.max_chain_len);
477 }
478
479 static void symtab_hash_eval(struct symtab *s)
480 {
481 int i;
482
483 for (i = 0; i < SYM_NUM; i++)
484 hash_eval(s[i].table, symtab_name[i]);
485 }
486
487 #else
488 static inline void hash_eval(struct hashtab *h, char *hash_name)
489 {
490 }
491 #endif
492
493 /*
494 * Define the other val_to_name and val_to_struct arrays
495 * in a policy database structure.
496 *
497 * Caller must clean up on failure.
498 */
499 static int policydb_index(struct policydb *p)
500 {
501 int i, rc;
502
503 printk(KERN_DEBUG "SELinux: %d users, %d roles, %d types, %d bools",
504 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
505 if (p->mls_enabled)
506 printk(", %d sens, %d cats", p->p_levels.nprim,
507 p->p_cats.nprim);
508 printk("\n");
509
510 printk(KERN_DEBUG "SELinux: %d classes, %d rules\n",
511 p->p_classes.nprim, p->te_avtab.nel);
512
513 #ifdef DEBUG_HASHES
514 avtab_hash_eval(&p->te_avtab, "rules");
515 symtab_hash_eval(p->symtab);
516 #endif
517
518 rc = -ENOMEM;
519 p->class_val_to_struct =
520 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
521 GFP_KERNEL);
522 if (!p->class_val_to_struct)
523 goto out;
524
525 rc = -ENOMEM;
526 p->role_val_to_struct =
527 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
528 GFP_KERNEL);
529 if (!p->role_val_to_struct)
530 goto out;
531
532 rc = -ENOMEM;
533 p->user_val_to_struct =
534 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
535 GFP_KERNEL);
536 if (!p->user_val_to_struct)
537 goto out;
538
539 /* Yes, I want the sizeof the pointer, not the structure */
540 rc = -ENOMEM;
541 p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
542 p->p_types.nprim,
543 GFP_KERNEL | __GFP_ZERO);
544 if (!p->type_val_to_struct_array)
545 goto out;
546
547 rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
548 p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
549 if (rc)
550 goto out;
551
552 rc = cond_init_bool_indexes(p);
553 if (rc)
554 goto out;
555
556 for (i = 0; i < SYM_NUM; i++) {
557 rc = -ENOMEM;
558 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
559 p->symtab[i].nprim,
560 GFP_KERNEL | __GFP_ZERO);
561 if (!p->sym_val_to_name[i])
562 goto out;
563
564 rc = flex_array_prealloc(p->sym_val_to_name[i],
565 0, p->symtab[i].nprim,
566 GFP_KERNEL | __GFP_ZERO);
567 if (rc)
568 goto out;
569
570 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
571 if (rc)
572 goto out;
573 }
574 rc = 0;
575 out:
576 return rc;
577 }
578
579 /*
580 * The following *_destroy functions are used to
581 * free any memory allocated for each kind of
582 * symbol data in the policy database.
583 */
584
585 static int perm_destroy(void *key, void *datum, void *p)
586 {
587 kfree(key);
588 kfree(datum);
589 return 0;
590 }
591
592 static int common_destroy(void *key, void *datum, void *p)
593 {
594 struct common_datum *comdatum;
595
596 kfree(key);
597 if (datum) {
598 comdatum = datum;
599 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
600 hashtab_destroy(comdatum->permissions.table);
601 }
602 kfree(datum);
603 return 0;
604 }
605
606 static int cls_destroy(void *key, void *datum, void *p)
607 {
608 struct class_datum *cladatum;
609 struct constraint_node *constraint, *ctemp;
610 struct constraint_expr *e, *etmp;
611
612 kfree(key);
613 if (datum) {
614 cladatum = datum;
615 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
616 hashtab_destroy(cladatum->permissions.table);
617 constraint = cladatum->constraints;
618 while (constraint) {
619 e = constraint->expr;
620 while (e) {
621 ebitmap_destroy(&e->names);
622 etmp = e;
623 e = e->next;
624 kfree(etmp);
625 }
626 ctemp = constraint;
627 constraint = constraint->next;
628 kfree(ctemp);
629 }
630
631 constraint = cladatum->validatetrans;
632 while (constraint) {
633 e = constraint->expr;
634 while (e) {
635 ebitmap_destroy(&e->names);
636 etmp = e;
637 e = e->next;
638 kfree(etmp);
639 }
640 ctemp = constraint;
641 constraint = constraint->next;
642 kfree(ctemp);
643 }
644
645 kfree(cladatum->comkey);
646 }
647 kfree(datum);
648 return 0;
649 }
650
651 static int role_destroy(void *key, void *datum, void *p)
652 {
653 struct role_datum *role;
654
655 kfree(key);
656 if (datum) {
657 role = datum;
658 ebitmap_destroy(&role->dominates);
659 ebitmap_destroy(&role->types);
660 }
661 kfree(datum);
662 return 0;
663 }
664
665 static int type_destroy(void *key, void *datum, void *p)
666 {
667 kfree(key);
668 kfree(datum);
669 return 0;
670 }
671
672 static int user_destroy(void *key, void *datum, void *p)
673 {
674 struct user_datum *usrdatum;
675
676 kfree(key);
677 if (datum) {
678 usrdatum = datum;
679 ebitmap_destroy(&usrdatum->roles);
680 ebitmap_destroy(&usrdatum->range.level[0].cat);
681 ebitmap_destroy(&usrdatum->range.level[1].cat);
682 ebitmap_destroy(&usrdatum->dfltlevel.cat);
683 }
684 kfree(datum);
685 return 0;
686 }
687
688 static int sens_destroy(void *key, void *datum, void *p)
689 {
690 struct level_datum *levdatum;
691
692 kfree(key);
693 if (datum) {
694 levdatum = datum;
695 ebitmap_destroy(&levdatum->level->cat);
696 kfree(levdatum->level);
697 }
698 kfree(datum);
699 return 0;
700 }
701
702 static int cat_destroy(void *key, void *datum, void *p)
703 {
704 kfree(key);
705 kfree(datum);
706 return 0;
707 }
708
709 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
710 {
711 common_destroy,
712 cls_destroy,
713 role_destroy,
714 type_destroy,
715 user_destroy,
716 cond_destroy_bool,
717 sens_destroy,
718 cat_destroy,
719 };
720
721 static int filenametr_destroy(void *key, void *datum, void *p)
722 {
723 struct filename_trans *ft = key;
724 kfree(ft->name);
725 kfree(key);
726 kfree(datum);
727 cond_resched();
728 return 0;
729 }
730
731 static int range_tr_destroy(void *key, void *datum, void *p)
732 {
733 struct mls_range *rt = datum;
734 kfree(key);
735 ebitmap_destroy(&rt->level[0].cat);
736 ebitmap_destroy(&rt->level[1].cat);
737 kfree(datum);
738 cond_resched();
739 return 0;
740 }
741
742 static void ocontext_destroy(struct ocontext *c, int i)
743 {
744 if (!c)
745 return;
746
747 context_destroy(&c->context[0]);
748 context_destroy(&c->context[1]);
749 if (i == OCON_ISID || i == OCON_FS ||
750 i == OCON_NETIF || i == OCON_FSUSE)
751 kfree(c->u.name);
752 kfree(c);
753 }
754
755 /*
756 * Free any memory allocated by a policy database structure.
757 */
758 void policydb_destroy(struct policydb *p)
759 {
760 struct ocontext *c, *ctmp;
761 struct genfs *g, *gtmp;
762 int i;
763 struct role_allow *ra, *lra = NULL;
764 struct role_trans *tr, *ltr = NULL;
765
766 for (i = 0; i < SYM_NUM; i++) {
767 cond_resched();
768 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
769 hashtab_destroy(p->symtab[i].table);
770 }
771
772 for (i = 0; i < SYM_NUM; i++) {
773 if (p->sym_val_to_name[i])
774 flex_array_free(p->sym_val_to_name[i]);
775 }
776
777 kfree(p->class_val_to_struct);
778 kfree(p->role_val_to_struct);
779 kfree(p->user_val_to_struct);
780 if (p->type_val_to_struct_array)
781 flex_array_free(p->type_val_to_struct_array);
782
783 avtab_destroy(&p->te_avtab);
784
785 for (i = 0; i < OCON_NUM; i++) {
786 cond_resched();
787 c = p->ocontexts[i];
788 while (c) {
789 ctmp = c;
790 c = c->next;
791 ocontext_destroy(ctmp, i);
792 }
793 p->ocontexts[i] = NULL;
794 }
795
796 g = p->genfs;
797 while (g) {
798 cond_resched();
799 kfree(g->fstype);
800 c = g->head;
801 while (c) {
802 ctmp = c;
803 c = c->next;
804 ocontext_destroy(ctmp, OCON_FSUSE);
805 }
806 gtmp = g;
807 g = g->next;
808 kfree(gtmp);
809 }
810 p->genfs = NULL;
811
812 cond_policydb_destroy(p);
813
814 for (tr = p->role_tr; tr; tr = tr->next) {
815 cond_resched();
816 kfree(ltr);
817 ltr = tr;
818 }
819 kfree(ltr);
820
821 for (ra = p->role_allow; ra; ra = ra->next) {
822 cond_resched();
823 kfree(lra);
824 lra = ra;
825 }
826 kfree(lra);
827
828 hashtab_map(p->filename_trans, filenametr_destroy, NULL);
829 hashtab_destroy(p->filename_trans);
830
831 hashtab_map(p->range_tr, range_tr_destroy, NULL);
832 hashtab_destroy(p->range_tr);
833
834 if (p->type_attr_map_array) {
835 for (i = 0; i < p->p_types.nprim; i++) {
836 struct ebitmap *e;
837
838 e = flex_array_get(p->type_attr_map_array, i);
839 if (!e)
840 continue;
841 ebitmap_destroy(e);
842 }
843 flex_array_free(p->type_attr_map_array);
844 }
845
846 ebitmap_destroy(&p->filename_trans_ttypes);
847 ebitmap_destroy(&p->policycaps);
848 ebitmap_destroy(&p->permissive_map);
849
850 return;
851 }
852
853 /*
854 * Load the initial SIDs specified in a policy database
855 * structure into a SID table.
856 */
857 int policydb_load_isids(struct policydb *p, struct sidtab *s)
858 {
859 struct ocontext *head, *c;
860 int rc;
861
862 rc = sidtab_init(s);
863 if (rc) {
864 printk(KERN_ERR "SELinux: out of memory on SID table init\n");
865 goto out;
866 }
867
868 head = p->ocontexts[OCON_ISID];
869 for (c = head; c; c = c->next) {
870 rc = -EINVAL;
871 if (!c->context[0].user) {
872 printk(KERN_ERR "SELinux: SID %s was never defined.\n",
873 c->u.name);
874 goto out;
875 }
876
877 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
878 if (rc) {
879 printk(KERN_ERR "SELinux: unable to load initial SID %s.\n",
880 c->u.name);
881 goto out;
882 }
883 }
884 rc = 0;
885 out:
886 return rc;
887 }
888
889 int policydb_class_isvalid(struct policydb *p, unsigned int class)
890 {
891 if (!class || class > p->p_classes.nprim)
892 return 0;
893 return 1;
894 }
895
896 int policydb_role_isvalid(struct policydb *p, unsigned int role)
897 {
898 if (!role || role > p->p_roles.nprim)
899 return 0;
900 return 1;
901 }
902
903 int policydb_type_isvalid(struct policydb *p, unsigned int type)
904 {
905 if (!type || type > p->p_types.nprim)
906 return 0;
907 return 1;
908 }
909
910 /*
911 * Return 1 if the fields in the security context
912 * structure `c' are valid. Return 0 otherwise.
913 */
914 int policydb_context_isvalid(struct policydb *p, struct context *c)
915 {
916 struct role_datum *role;
917 struct user_datum *usrdatum;
918
919 if (!c->role || c->role > p->p_roles.nprim)
920 return 0;
921
922 if (!c->user || c->user > p->p_users.nprim)
923 return 0;
924
925 if (!c->type || c->type > p->p_types.nprim)
926 return 0;
927
928 if (c->role != OBJECT_R_VAL) {
929 /*
930 * Role must be authorized for the type.
931 */
932 role = p->role_val_to_struct[c->role - 1];
933 if (!ebitmap_get_bit(&role->types, c->type - 1))
934 /* role may not be associated with type */
935 return 0;
936
937 /*
938 * User must be authorized for the role.
939 */
940 usrdatum = p->user_val_to_struct[c->user - 1];
941 if (!usrdatum)
942 return 0;
943
944 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
945 /* user may not be associated with role */
946 return 0;
947 }
948
949 if (!mls_context_isvalid(p, c))
950 return 0;
951
952 return 1;
953 }
954
955 /*
956 * Read a MLS range structure from a policydb binary
957 * representation file.
958 */
959 static int mls_read_range_helper(struct mls_range *r, void *fp)
960 {
961 __le32 buf[2];
962 u32 items;
963 int rc;
964
965 rc = next_entry(buf, fp, sizeof(u32));
966 if (rc)
967 goto out;
968
969 rc = -EINVAL;
970 items = le32_to_cpu(buf[0]);
971 if (items > ARRAY_SIZE(buf)) {
972 printk(KERN_ERR "SELinux: mls: range overflow\n");
973 goto out;
974 }
975
976 rc = next_entry(buf, fp, sizeof(u32) * items);
977 if (rc) {
978 printk(KERN_ERR "SELinux: mls: truncated range\n");
979 goto out;
980 }
981
982 r->level[0].sens = le32_to_cpu(buf[0]);
983 if (items > 1)
984 r->level[1].sens = le32_to_cpu(buf[1]);
985 else
986 r->level[1].sens = r->level[0].sens;
987
988 rc = ebitmap_read(&r->level[0].cat, fp);
989 if (rc) {
990 printk(KERN_ERR "SELinux: mls: error reading low categories\n");
991 goto out;
992 }
993 if (items > 1) {
994 rc = ebitmap_read(&r->level[1].cat, fp);
995 if (rc) {
996 printk(KERN_ERR "SELinux: mls: error reading high categories\n");
997 goto bad_high;
998 }
999 } else {
1000 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1001 if (rc) {
1002 printk(KERN_ERR "SELinux: mls: out of memory\n");
1003 goto bad_high;
1004 }
1005 }
1006
1007 return 0;
1008 bad_high:
1009 ebitmap_destroy(&r->level[0].cat);
1010 out:
1011 return rc;
1012 }
1013
1014 /*
1015 * Read and validate a security context structure
1016 * from a policydb binary representation file.
1017 */
1018 static int context_read_and_validate(struct context *c,
1019 struct policydb *p,
1020 void *fp)
1021 {
1022 __le32 buf[3];
1023 int rc;
1024
1025 rc = next_entry(buf, fp, sizeof buf);
1026 if (rc) {
1027 printk(KERN_ERR "SELinux: context truncated\n");
1028 goto out;
1029 }
1030 c->user = le32_to_cpu(buf[0]);
1031 c->role = le32_to_cpu(buf[1]);
1032 c->type = le32_to_cpu(buf[2]);
1033 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1034 rc = mls_read_range_helper(&c->range, fp);
1035 if (rc) {
1036 printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1037 goto out;
1038 }
1039 }
1040
1041 rc = -EINVAL;
1042 if (!policydb_context_isvalid(p, c)) {
1043 printk(KERN_ERR "SELinux: invalid security context\n");
1044 context_destroy(c);
1045 goto out;
1046 }
1047 rc = 0;
1048 out:
1049 return rc;
1050 }
1051
1052 /*
1053 * The following *_read functions are used to
1054 * read the symbol data from a policy database
1055 * binary representation file.
1056 */
1057
1058 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1059 {
1060 char *key = NULL;
1061 struct perm_datum *perdatum;
1062 int rc;
1063 __le32 buf[2];
1064 u32 len;
1065
1066 rc = -ENOMEM;
1067 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1068 if (!perdatum)
1069 goto bad;
1070
1071 rc = next_entry(buf, fp, sizeof buf);
1072 if (rc)
1073 goto bad;
1074
1075 len = le32_to_cpu(buf[0]);
1076 perdatum->value = le32_to_cpu(buf[1]);
1077
1078 rc = -ENOMEM;
1079 key = kmalloc(len + 1, GFP_KERNEL);
1080 if (!key)
1081 goto bad;
1082
1083 rc = next_entry(key, fp, len);
1084 if (rc)
1085 goto bad;
1086 key[len] = '\0';
1087
1088 rc = hashtab_insert(h, key, perdatum);
1089 if (rc)
1090 goto bad;
1091
1092 return 0;
1093 bad:
1094 perm_destroy(key, perdatum, NULL);
1095 return rc;
1096 }
1097
1098 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1099 {
1100 char *key = NULL;
1101 struct common_datum *comdatum;
1102 __le32 buf[4];
1103 u32 len, nel;
1104 int i, rc;
1105
1106 rc = -ENOMEM;
1107 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1108 if (!comdatum)
1109 goto bad;
1110
1111 rc = next_entry(buf, fp, sizeof buf);
1112 if (rc)
1113 goto bad;
1114
1115 len = le32_to_cpu(buf[0]);
1116 comdatum->value = le32_to_cpu(buf[1]);
1117
1118 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1119 if (rc)
1120 goto bad;
1121 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1122 nel = le32_to_cpu(buf[3]);
1123
1124 rc = -ENOMEM;
1125 key = kmalloc(len + 1, GFP_KERNEL);
1126 if (!key)
1127 goto bad;
1128
1129 rc = next_entry(key, fp, len);
1130 if (rc)
1131 goto bad;
1132 key[len] = '\0';
1133
1134 for (i = 0; i < nel; i++) {
1135 rc = perm_read(p, comdatum->permissions.table, fp);
1136 if (rc)
1137 goto bad;
1138 }
1139
1140 rc = hashtab_insert(h, key, comdatum);
1141 if (rc)
1142 goto bad;
1143 return 0;
1144 bad:
1145 common_destroy(key, comdatum, NULL);
1146 return rc;
1147 }
1148
1149 static int read_cons_helper(struct constraint_node **nodep, int ncons,
1150 int allowxtarget, void *fp)
1151 {
1152 struct constraint_node *c, *lc;
1153 struct constraint_expr *e, *le;
1154 __le32 buf[3];
1155 u32 nexpr;
1156 int rc, i, j, depth;
1157
1158 lc = NULL;
1159 for (i = 0; i < ncons; i++) {
1160 c = kzalloc(sizeof(*c), GFP_KERNEL);
1161 if (!c)
1162 return -ENOMEM;
1163
1164 if (lc)
1165 lc->next = c;
1166 else
1167 *nodep = c;
1168
1169 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1170 if (rc)
1171 return rc;
1172 c->permissions = le32_to_cpu(buf[0]);
1173 nexpr = le32_to_cpu(buf[1]);
1174 le = NULL;
1175 depth = -1;
1176 for (j = 0; j < nexpr; j++) {
1177 e = kzalloc(sizeof(*e), GFP_KERNEL);
1178 if (!e)
1179 return -ENOMEM;
1180
1181 if (le)
1182 le->next = e;
1183 else
1184 c->expr = e;
1185
1186 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1187 if (rc)
1188 return rc;
1189 e->expr_type = le32_to_cpu(buf[0]);
1190 e->attr = le32_to_cpu(buf[1]);
1191 e->op = le32_to_cpu(buf[2]);
1192
1193 switch (e->expr_type) {
1194 case CEXPR_NOT:
1195 if (depth < 0)
1196 return -EINVAL;
1197 break;
1198 case CEXPR_AND:
1199 case CEXPR_OR:
1200 if (depth < 1)
1201 return -EINVAL;
1202 depth--;
1203 break;
1204 case CEXPR_ATTR:
1205 if (depth == (CEXPR_MAXDEPTH - 1))
1206 return -EINVAL;
1207 depth++;
1208 break;
1209 case CEXPR_NAMES:
1210 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1211 return -EINVAL;
1212 if (depth == (CEXPR_MAXDEPTH - 1))
1213 return -EINVAL;
1214 depth++;
1215 rc = ebitmap_read(&e->names, fp);
1216 if (rc)
1217 return rc;
1218 break;
1219 default:
1220 return -EINVAL;
1221 }
1222 le = e;
1223 }
1224 if (depth != 0)
1225 return -EINVAL;
1226 lc = c;
1227 }
1228
1229 return 0;
1230 }
1231
1232 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1233 {
1234 char *key = NULL;
1235 struct class_datum *cladatum;
1236 __le32 buf[6];
1237 u32 len, len2, ncons, nel;
1238 int i, rc;
1239
1240 rc = -ENOMEM;
1241 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1242 if (!cladatum)
1243 goto bad;
1244
1245 rc = next_entry(buf, fp, sizeof(u32)*6);
1246 if (rc)
1247 goto bad;
1248
1249 len = le32_to_cpu(buf[0]);
1250 len2 = le32_to_cpu(buf[1]);
1251 cladatum->value = le32_to_cpu(buf[2]);
1252
1253 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1254 if (rc)
1255 goto bad;
1256 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1257 nel = le32_to_cpu(buf[4]);
1258
1259 ncons = le32_to_cpu(buf[5]);
1260
1261 rc = -ENOMEM;
1262 key = kmalloc(len + 1, GFP_KERNEL);
1263 if (!key)
1264 goto bad;
1265
1266 rc = next_entry(key, fp, len);
1267 if (rc)
1268 goto bad;
1269 key[len] = '\0';
1270
1271 if (len2) {
1272 rc = -ENOMEM;
1273 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1274 if (!cladatum->comkey)
1275 goto bad;
1276 rc = next_entry(cladatum->comkey, fp, len2);
1277 if (rc)
1278 goto bad;
1279 cladatum->comkey[len2] = '\0';
1280
1281 rc = -EINVAL;
1282 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1283 if (!cladatum->comdatum) {
1284 printk(KERN_ERR "SELinux: unknown common %s\n", cladatum->comkey);
1285 goto bad;
1286 }
1287 }
1288 for (i = 0; i < nel; i++) {
1289 rc = perm_read(p, cladatum->permissions.table, fp);
1290 if (rc)
1291 goto bad;
1292 }
1293
1294 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1295 if (rc)
1296 goto bad;
1297
1298 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1299 /* grab the validatetrans rules */
1300 rc = next_entry(buf, fp, sizeof(u32));
1301 if (rc)
1302 goto bad;
1303 ncons = le32_to_cpu(buf[0]);
1304 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1305 if (rc)
1306 goto bad;
1307 }
1308
1309 rc = hashtab_insert(h, key, cladatum);
1310 if (rc)
1311 goto bad;
1312
1313 return 0;
1314 bad:
1315 cls_destroy(key, cladatum, NULL);
1316 return rc;
1317 }
1318
1319 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1320 {
1321 char *key = NULL;
1322 struct role_datum *role;
1323 int rc, to_read = 2;
1324 __le32 buf[3];
1325 u32 len;
1326
1327 rc = -ENOMEM;
1328 role = kzalloc(sizeof(*role), GFP_KERNEL);
1329 if (!role)
1330 goto bad;
1331
1332 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1333 to_read = 3;
1334
1335 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1336 if (rc)
1337 goto bad;
1338
1339 len = le32_to_cpu(buf[0]);
1340 role->value = le32_to_cpu(buf[1]);
1341 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1342 role->bounds = le32_to_cpu(buf[2]);
1343
1344 rc = -ENOMEM;
1345 key = kmalloc(len + 1, GFP_KERNEL);
1346 if (!key)
1347 goto bad;
1348
1349 rc = next_entry(key, fp, len);
1350 if (rc)
1351 goto bad;
1352 key[len] = '\0';
1353
1354 rc = ebitmap_read(&role->dominates, fp);
1355 if (rc)
1356 goto bad;
1357
1358 rc = ebitmap_read(&role->types, fp);
1359 if (rc)
1360 goto bad;
1361
1362 if (strcmp(key, OBJECT_R) == 0) {
1363 rc = -EINVAL;
1364 if (role->value != OBJECT_R_VAL) {
1365 printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1366 OBJECT_R, role->value);
1367 goto bad;
1368 }
1369 rc = 0;
1370 goto bad;
1371 }
1372
1373 rc = hashtab_insert(h, key, role);
1374 if (rc)
1375 goto bad;
1376 return 0;
1377 bad:
1378 role_destroy(key, role, NULL);
1379 return rc;
1380 }
1381
1382 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1383 {
1384 char *key = NULL;
1385 struct type_datum *typdatum;
1386 int rc, to_read = 3;
1387 __le32 buf[4];
1388 u32 len;
1389
1390 rc = -ENOMEM;
1391 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1392 if (!typdatum)
1393 goto bad;
1394
1395 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1396 to_read = 4;
1397
1398 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1399 if (rc)
1400 goto bad;
1401
1402 len = le32_to_cpu(buf[0]);
1403 typdatum->value = le32_to_cpu(buf[1]);
1404 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1405 u32 prop = le32_to_cpu(buf[2]);
1406
1407 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1408 typdatum->primary = 1;
1409 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1410 typdatum->attribute = 1;
1411
1412 typdatum->bounds = le32_to_cpu(buf[3]);
1413 } else {
1414 typdatum->primary = le32_to_cpu(buf[2]);
1415 }
1416
1417 rc = -ENOMEM;
1418 key = kmalloc(len + 1, GFP_KERNEL);
1419 if (!key)
1420 goto bad;
1421 rc = next_entry(key, fp, len);
1422 if (rc)
1423 goto bad;
1424 key[len] = '\0';
1425
1426 rc = hashtab_insert(h, key, typdatum);
1427 if (rc)
1428 goto bad;
1429 return 0;
1430 bad:
1431 type_destroy(key, typdatum, NULL);
1432 return rc;
1433 }
1434
1435
1436 /*
1437 * Read a MLS level structure from a policydb binary
1438 * representation file.
1439 */
1440 static int mls_read_level(struct mls_level *lp, void *fp)
1441 {
1442 __le32 buf[1];
1443 int rc;
1444
1445 memset(lp, 0, sizeof(*lp));
1446
1447 rc = next_entry(buf, fp, sizeof buf);
1448 if (rc) {
1449 printk(KERN_ERR "SELinux: mls: truncated level\n");
1450 return rc;
1451 }
1452 lp->sens = le32_to_cpu(buf[0]);
1453
1454 rc = ebitmap_read(&lp->cat, fp);
1455 if (rc) {
1456 printk(KERN_ERR "SELinux: mls: error reading level categories\n");
1457 return rc;
1458 }
1459 return 0;
1460 }
1461
1462 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1463 {
1464 char *key = NULL;
1465 struct user_datum *usrdatum;
1466 int rc, to_read = 2;
1467 __le32 buf[3];
1468 u32 len;
1469
1470 rc = -ENOMEM;
1471 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1472 if (!usrdatum)
1473 goto bad;
1474
1475 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1476 to_read = 3;
1477
1478 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1479 if (rc)
1480 goto bad;
1481
1482 len = le32_to_cpu(buf[0]);
1483 usrdatum->value = le32_to_cpu(buf[1]);
1484 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1485 usrdatum->bounds = le32_to_cpu(buf[2]);
1486
1487 rc = -ENOMEM;
1488 key = kmalloc(len + 1, GFP_KERNEL);
1489 if (!key)
1490 goto bad;
1491 rc = next_entry(key, fp, len);
1492 if (rc)
1493 goto bad;
1494 key[len] = '\0';
1495
1496 rc = ebitmap_read(&usrdatum->roles, fp);
1497 if (rc)
1498 goto bad;
1499
1500 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1501 rc = mls_read_range_helper(&usrdatum->range, fp);
1502 if (rc)
1503 goto bad;
1504 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1505 if (rc)
1506 goto bad;
1507 }
1508
1509 rc = hashtab_insert(h, key, usrdatum);
1510 if (rc)
1511 goto bad;
1512 return 0;
1513 bad:
1514 user_destroy(key, usrdatum, NULL);
1515 return rc;
1516 }
1517
1518 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1519 {
1520 char *key = NULL;
1521 struct level_datum *levdatum;
1522 int rc;
1523 __le32 buf[2];
1524 u32 len;
1525
1526 rc = -ENOMEM;
1527 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1528 if (!levdatum)
1529 goto bad;
1530
1531 rc = next_entry(buf, fp, sizeof buf);
1532 if (rc)
1533 goto bad;
1534
1535 len = le32_to_cpu(buf[0]);
1536 levdatum->isalias = le32_to_cpu(buf[1]);
1537
1538 rc = -ENOMEM;
1539 key = kmalloc(len + 1, GFP_ATOMIC);
1540 if (!key)
1541 goto bad;
1542 rc = next_entry(key, fp, len);
1543 if (rc)
1544 goto bad;
1545 key[len] = '\0';
1546
1547 rc = -ENOMEM;
1548 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1549 if (!levdatum->level)
1550 goto bad;
1551
1552 rc = mls_read_level(levdatum->level, fp);
1553 if (rc)
1554 goto bad;
1555
1556 rc = hashtab_insert(h, key, levdatum);
1557 if (rc)
1558 goto bad;
1559 return 0;
1560 bad:
1561 sens_destroy(key, levdatum, NULL);
1562 return rc;
1563 }
1564
1565 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1566 {
1567 char *key = NULL;
1568 struct cat_datum *catdatum;
1569 int rc;
1570 __le32 buf[3];
1571 u32 len;
1572
1573 rc = -ENOMEM;
1574 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1575 if (!catdatum)
1576 goto bad;
1577
1578 rc = next_entry(buf, fp, sizeof buf);
1579 if (rc)
1580 goto bad;
1581
1582 len = le32_to_cpu(buf[0]);
1583 catdatum->value = le32_to_cpu(buf[1]);
1584 catdatum->isalias = le32_to_cpu(buf[2]);
1585
1586 rc = -ENOMEM;
1587 key = kmalloc(len + 1, GFP_ATOMIC);
1588 if (!key)
1589 goto bad;
1590 rc = next_entry(key, fp, len);
1591 if (rc)
1592 goto bad;
1593 key[len] = '\0';
1594
1595 rc = hashtab_insert(h, key, catdatum);
1596 if (rc)
1597 goto bad;
1598 return 0;
1599 bad:
1600 cat_destroy(key, catdatum, NULL);
1601 return rc;
1602 }
1603
1604 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1605 {
1606 common_read,
1607 class_read,
1608 role_read,
1609 type_read,
1610 user_read,
1611 cond_read_bool,
1612 sens_read,
1613 cat_read,
1614 };
1615
1616 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1617 {
1618 struct user_datum *upper, *user;
1619 struct policydb *p = datap;
1620 int depth = 0;
1621
1622 upper = user = datum;
1623 while (upper->bounds) {
1624 struct ebitmap_node *node;
1625 unsigned long bit;
1626
1627 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1628 printk(KERN_ERR "SELinux: user %s: "
1629 "too deep or looped boundary",
1630 (char *) key);
1631 return -EINVAL;
1632 }
1633
1634 upper = p->user_val_to_struct[upper->bounds - 1];
1635 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1636 if (ebitmap_get_bit(&upper->roles, bit))
1637 continue;
1638
1639 printk(KERN_ERR
1640 "SELinux: boundary violated policy: "
1641 "user=%s role=%s bounds=%s\n",
1642 sym_name(p, SYM_USERS, user->value - 1),
1643 sym_name(p, SYM_ROLES, bit),
1644 sym_name(p, SYM_USERS, upper->value - 1));
1645
1646 return -EINVAL;
1647 }
1648 }
1649
1650 return 0;
1651 }
1652
1653 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1654 {
1655 struct role_datum *upper, *role;
1656 struct policydb *p = datap;
1657 int depth = 0;
1658
1659 upper = role = datum;
1660 while (upper->bounds) {
1661 struct ebitmap_node *node;
1662 unsigned long bit;
1663
1664 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1665 printk(KERN_ERR "SELinux: role %s: "
1666 "too deep or looped bounds\n",
1667 (char *) key);
1668 return -EINVAL;
1669 }
1670
1671 upper = p->role_val_to_struct[upper->bounds - 1];
1672 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1673 if (ebitmap_get_bit(&upper->types, bit))
1674 continue;
1675
1676 printk(KERN_ERR
1677 "SELinux: boundary violated policy: "
1678 "role=%s type=%s bounds=%s\n",
1679 sym_name(p, SYM_ROLES, role->value - 1),
1680 sym_name(p, SYM_TYPES, bit),
1681 sym_name(p, SYM_ROLES, upper->value - 1));
1682
1683 return -EINVAL;
1684 }
1685 }
1686
1687 return 0;
1688 }
1689
1690 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1691 {
1692 struct type_datum *upper;
1693 struct policydb *p = datap;
1694 int depth = 0;
1695
1696 upper = datum;
1697 while (upper->bounds) {
1698 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1699 printk(KERN_ERR "SELinux: type %s: "
1700 "too deep or looped boundary\n",
1701 (char *) key);
1702 return -EINVAL;
1703 }
1704
1705 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1706 upper->bounds - 1);
1707 BUG_ON(!upper);
1708
1709 if (upper->attribute) {
1710 printk(KERN_ERR "SELinux: type %s: "
1711 "bounded by attribute %s",
1712 (char *) key,
1713 sym_name(p, SYM_TYPES, upper->value - 1));
1714 return -EINVAL;
1715 }
1716 }
1717
1718 return 0;
1719 }
1720
1721 static int policydb_bounds_sanity_check(struct policydb *p)
1722 {
1723 int rc;
1724
1725 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1726 return 0;
1727
1728 rc = hashtab_map(p->p_users.table,
1729 user_bounds_sanity_check, p);
1730 if (rc)
1731 return rc;
1732
1733 rc = hashtab_map(p->p_roles.table,
1734 role_bounds_sanity_check, p);
1735 if (rc)
1736 return rc;
1737
1738 rc = hashtab_map(p->p_types.table,
1739 type_bounds_sanity_check, p);
1740 if (rc)
1741 return rc;
1742
1743 return 0;
1744 }
1745
1746 extern int ss_initialized;
1747
1748 u16 string_to_security_class(struct policydb *p, const char *name)
1749 {
1750 struct class_datum *cladatum;
1751
1752 cladatum = hashtab_search(p->p_classes.table, name);
1753 if (!cladatum)
1754 return 0;
1755
1756 return cladatum->value;
1757 }
1758
1759 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1760 {
1761 struct class_datum *cladatum;
1762 struct perm_datum *perdatum = NULL;
1763 struct common_datum *comdatum;
1764
1765 if (!tclass || tclass > p->p_classes.nprim)
1766 return 0;
1767
1768 cladatum = p->class_val_to_struct[tclass-1];
1769 comdatum = cladatum->comdatum;
1770 if (comdatum)
1771 perdatum = hashtab_search(comdatum->permissions.table,
1772 name);
1773 if (!perdatum)
1774 perdatum = hashtab_search(cladatum->permissions.table,
1775 name);
1776 if (!perdatum)
1777 return 0;
1778
1779 return 1U << (perdatum->value-1);
1780 }
1781
1782 static int range_read(struct policydb *p, void *fp)
1783 {
1784 struct range_trans *rt = NULL;
1785 struct mls_range *r = NULL;
1786 int i, rc;
1787 __le32 buf[2];
1788 u32 nel;
1789
1790 if (p->policyvers < POLICYDB_VERSION_MLS)
1791 return 0;
1792
1793 rc = next_entry(buf, fp, sizeof(u32));
1794 if (rc)
1795 goto out;
1796
1797 nel = le32_to_cpu(buf[0]);
1798 for (i = 0; i < nel; i++) {
1799 rc = -ENOMEM;
1800 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1801 if (!rt)
1802 goto out;
1803
1804 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1805 if (rc)
1806 goto out;
1807
1808 rt->source_type = le32_to_cpu(buf[0]);
1809 rt->target_type = le32_to_cpu(buf[1]);
1810 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1811 rc = next_entry(buf, fp, sizeof(u32));
1812 if (rc)
1813 goto out;
1814 rt->target_class = le32_to_cpu(buf[0]);
1815 } else
1816 rt->target_class = p->process_class;
1817
1818 rc = -EINVAL;
1819 if (!policydb_type_isvalid(p, rt->source_type) ||
1820 !policydb_type_isvalid(p, rt->target_type) ||
1821 !policydb_class_isvalid(p, rt->target_class))
1822 goto out;
1823
1824 rc = -ENOMEM;
1825 r = kzalloc(sizeof(*r), GFP_KERNEL);
1826 if (!r)
1827 goto out;
1828
1829 rc = mls_read_range_helper(r, fp);
1830 if (rc)
1831 goto out;
1832
1833 rc = -EINVAL;
1834 if (!mls_range_isvalid(p, r)) {
1835 printk(KERN_WARNING "SELinux: rangetrans: invalid range\n");
1836 goto out;
1837 }
1838
1839 rc = hashtab_insert(p->range_tr, rt, r);
1840 if (rc)
1841 goto out;
1842
1843 rt = NULL;
1844 r = NULL;
1845 }
1846 hash_eval(p->range_tr, "rangetr");
1847 rc = 0;
1848 out:
1849 kfree(rt);
1850 kfree(r);
1851 return rc;
1852 }
1853
1854 static int filename_trans_read(struct policydb *p, void *fp)
1855 {
1856 struct filename_trans *ft;
1857 struct filename_trans_datum *otype;
1858 char *name;
1859 u32 nel, len;
1860 __le32 buf[4];
1861 int rc, i;
1862
1863 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1864 return 0;
1865
1866 rc = next_entry(buf, fp, sizeof(u32));
1867 if (rc)
1868 return rc;
1869 nel = le32_to_cpu(buf[0]);
1870
1871 for (i = 0; i < nel; i++) {
1872 ft = NULL;
1873 otype = NULL;
1874 name = NULL;
1875
1876 rc = -ENOMEM;
1877 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1878 if (!ft)
1879 goto out;
1880
1881 rc = -ENOMEM;
1882 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1883 if (!otype)
1884 goto out;
1885
1886 /* length of the path component string */
1887 rc = next_entry(buf, fp, sizeof(u32));
1888 if (rc)
1889 goto out;
1890 len = le32_to_cpu(buf[0]);
1891
1892 rc = -ENOMEM;
1893 name = kmalloc(len + 1, GFP_KERNEL);
1894 if (!name)
1895 goto out;
1896
1897 ft->name = name;
1898
1899 /* path component string */
1900 rc = next_entry(name, fp, len);
1901 if (rc)
1902 goto out;
1903 name[len] = 0;
1904
1905 rc = next_entry(buf, fp, sizeof(u32) * 4);
1906 if (rc)
1907 goto out;
1908
1909 ft->stype = le32_to_cpu(buf[0]);
1910 ft->ttype = le32_to_cpu(buf[1]);
1911 ft->tclass = le32_to_cpu(buf[2]);
1912
1913 otype->otype = le32_to_cpu(buf[3]);
1914
1915 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1916 if (rc)
1917 goto out;
1918
1919 hashtab_insert(p->filename_trans, ft, otype);
1920 }
1921 hash_eval(p->filename_trans, "filenametr");
1922 return 0;
1923 out:
1924 kfree(ft);
1925 kfree(name);
1926 kfree(otype);
1927
1928 return rc;
1929 }
1930
1931 static int genfs_read(struct policydb *p, void *fp)
1932 {
1933 int i, j, rc;
1934 u32 nel, nel2, len, len2;
1935 __le32 buf[1];
1936 struct ocontext *l, *c;
1937 struct ocontext *newc = NULL;
1938 struct genfs *genfs_p, *genfs;
1939 struct genfs *newgenfs = NULL;
1940
1941 rc = next_entry(buf, fp, sizeof(u32));
1942 if (rc)
1943 goto out;
1944 nel = le32_to_cpu(buf[0]);
1945
1946 for (i = 0; i < nel; i++) {
1947 rc = next_entry(buf, fp, sizeof(u32));
1948 if (rc)
1949 goto out;
1950 len = le32_to_cpu(buf[0]);
1951
1952 rc = -ENOMEM;
1953 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1954 if (!newgenfs)
1955 goto out;
1956
1957 rc = -ENOMEM;
1958 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
1959 if (!newgenfs->fstype)
1960 goto out;
1961
1962 rc = next_entry(newgenfs->fstype, fp, len);
1963 if (rc)
1964 goto out;
1965
1966 newgenfs->fstype[len] = 0;
1967
1968 for (genfs_p = NULL, genfs = p->genfs; genfs;
1969 genfs_p = genfs, genfs = genfs->next) {
1970 rc = -EINVAL;
1971 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1972 printk(KERN_ERR "SELinux: dup genfs fstype %s\n",
1973 newgenfs->fstype);
1974 goto out;
1975 }
1976 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1977 break;
1978 }
1979 newgenfs->next = genfs;
1980 if (genfs_p)
1981 genfs_p->next = newgenfs;
1982 else
1983 p->genfs = newgenfs;
1984 genfs = newgenfs;
1985 newgenfs = NULL;
1986
1987 rc = next_entry(buf, fp, sizeof(u32));
1988 if (rc)
1989 goto out;
1990
1991 nel2 = le32_to_cpu(buf[0]);
1992 for (j = 0; j < nel2; j++) {
1993 rc = next_entry(buf, fp, sizeof(u32));
1994 if (rc)
1995 goto out;
1996 len = le32_to_cpu(buf[0]);
1997
1998 rc = -ENOMEM;
1999 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2000 if (!newc)
2001 goto out;
2002
2003 rc = -ENOMEM;
2004 newc->u.name = kmalloc(len + 1, GFP_KERNEL);
2005 if (!newc->u.name)
2006 goto out;
2007
2008 rc = next_entry(newc->u.name, fp, len);
2009 if (rc)
2010 goto out;
2011 newc->u.name[len] = 0;
2012
2013 rc = next_entry(buf, fp, sizeof(u32));
2014 if (rc)
2015 goto out;
2016
2017 newc->v.sclass = le32_to_cpu(buf[0]);
2018 rc = context_read_and_validate(&newc->context[0], p, fp);
2019 if (rc)
2020 goto out;
2021
2022 for (l = NULL, c = genfs->head; c;
2023 l = c, c = c->next) {
2024 rc = -EINVAL;
2025 if (!strcmp(newc->u.name, c->u.name) &&
2026 (!c->v.sclass || !newc->v.sclass ||
2027 newc->v.sclass == c->v.sclass)) {
2028 printk(KERN_ERR "SELinux: dup genfs entry (%s,%s)\n",
2029 genfs->fstype, c->u.name);
2030 goto out;
2031 }
2032 len = strlen(newc->u.name);
2033 len2 = strlen(c->u.name);
2034 if (len > len2)
2035 break;
2036 }
2037
2038 newc->next = c;
2039 if (l)
2040 l->next = newc;
2041 else
2042 genfs->head = newc;
2043 newc = NULL;
2044 }
2045 }
2046 rc = 0;
2047 out:
2048 if (newgenfs)
2049 kfree(newgenfs->fstype);
2050 kfree(newgenfs);
2051 ocontext_destroy(newc, OCON_FSUSE);
2052
2053 return rc;
2054 }
2055
2056 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2057 void *fp)
2058 {
2059 int i, j, rc;
2060 u32 nel, len;
2061 __le32 buf[3];
2062 struct ocontext *l, *c;
2063 u32 nodebuf[8];
2064
2065 for (i = 0; i < info->ocon_num; i++) {
2066 rc = next_entry(buf, fp, sizeof(u32));
2067 if (rc)
2068 goto out;
2069 nel = le32_to_cpu(buf[0]);
2070
2071 l = NULL;
2072 for (j = 0; j < nel; j++) {
2073 rc = -ENOMEM;
2074 c = kzalloc(sizeof(*c), GFP_KERNEL);
2075 if (!c)
2076 goto out;
2077 if (l)
2078 l->next = c;
2079 else
2080 p->ocontexts[i] = c;
2081 l = c;
2082
2083 switch (i) {
2084 case OCON_ISID:
2085 rc = next_entry(buf, fp, sizeof(u32));
2086 if (rc)
2087 goto out;
2088
2089 c->sid[0] = le32_to_cpu(buf[0]);
2090 rc = context_read_and_validate(&c->context[0], p, fp);
2091 if (rc)
2092 goto out;
2093 break;
2094 case OCON_FS:
2095 case OCON_NETIF:
2096 rc = next_entry(buf, fp, sizeof(u32));
2097 if (rc)
2098 goto out;
2099 len = le32_to_cpu(buf[0]);
2100
2101 rc = -ENOMEM;
2102 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2103 if (!c->u.name)
2104 goto out;
2105
2106 rc = next_entry(c->u.name, fp, len);
2107 if (rc)
2108 goto out;
2109
2110 c->u.name[len] = 0;
2111 rc = context_read_and_validate(&c->context[0], p, fp);
2112 if (rc)
2113 goto out;
2114 rc = context_read_and_validate(&c->context[1], p, fp);
2115 if (rc)
2116 goto out;
2117 break;
2118 case OCON_PORT:
2119 rc = next_entry(buf, fp, sizeof(u32)*3);
2120 if (rc)
2121 goto out;
2122 c->u.port.protocol = le32_to_cpu(buf[0]);
2123 c->u.port.low_port = le32_to_cpu(buf[1]);
2124 c->u.port.high_port = le32_to_cpu(buf[2]);
2125 rc = context_read_and_validate(&c->context[0], p, fp);
2126 if (rc)
2127 goto out;
2128 break;
2129 case OCON_NODE:
2130 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2131 if (rc)
2132 goto out;
2133 c->u.node.addr = nodebuf[0]; /* network order */
2134 c->u.node.mask = nodebuf[1]; /* network order */
2135 rc = context_read_and_validate(&c->context[0], p, fp);
2136 if (rc)
2137 goto out;
2138 break;
2139 case OCON_FSUSE:
2140 rc = next_entry(buf, fp, sizeof(u32)*2);
2141 if (rc)
2142 goto out;
2143
2144 rc = -EINVAL;
2145 c->v.behavior = le32_to_cpu(buf[0]);
2146 if (c->v.behavior > SECURITY_FS_USE_NONE)
2147 goto out;
2148
2149 rc = -ENOMEM;
2150 len = le32_to_cpu(buf[1]);
2151 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2152 if (!c->u.name)
2153 goto out;
2154
2155 rc = next_entry(c->u.name, fp, len);
2156 if (rc)
2157 goto out;
2158 c->u.name[len] = 0;
2159 rc = context_read_and_validate(&c->context[0], p, fp);
2160 if (rc)
2161 goto out;
2162 break;
2163 case OCON_NODE6: {
2164 int k;
2165
2166 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2167 if (rc)
2168 goto out;
2169 for (k = 0; k < 4; k++)
2170 c->u.node6.addr[k] = nodebuf[k];
2171 for (k = 0; k < 4; k++)
2172 c->u.node6.mask[k] = nodebuf[k+4];
2173 rc = context_read_and_validate(&c->context[0], p, fp);
2174 if (rc)
2175 goto out;
2176 break;
2177 }
2178 }
2179 }
2180 }
2181 rc = 0;
2182 out:
2183 return rc;
2184 }
2185
2186 /*
2187 * Read the configuration data from a policy database binary
2188 * representation file into a policy database structure.
2189 */
2190 int policydb_read(struct policydb *p, void *fp)
2191 {
2192 struct role_allow *ra, *lra;
2193 struct role_trans *tr, *ltr;
2194 int i, j, rc;
2195 __le32 buf[4];
2196 u32 len, nprim, nel;
2197
2198 char *policydb_str;
2199 struct policydb_compat_info *info;
2200
2201 rc = policydb_init(p);
2202 if (rc)
2203 return rc;
2204
2205 /* Read the magic number and string length. */
2206 rc = next_entry(buf, fp, sizeof(u32) * 2);
2207 if (rc)
2208 goto bad;
2209
2210 rc = -EINVAL;
2211 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2212 printk(KERN_ERR "SELinux: policydb magic number 0x%x does "
2213 "not match expected magic number 0x%x\n",
2214 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2215 goto bad;
2216 }
2217
2218 rc = -EINVAL;
2219 len = le32_to_cpu(buf[1]);
2220 if (len != strlen(POLICYDB_STRING)) {
2221 printk(KERN_ERR "SELinux: policydb string length %d does not "
2222 "match expected length %Zu\n",
2223 len, strlen(POLICYDB_STRING));
2224 goto bad;
2225 }
2226
2227 rc = -ENOMEM;
2228 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2229 if (!policydb_str) {
2230 printk(KERN_ERR "SELinux: unable to allocate memory for policydb "
2231 "string of length %d\n", len);
2232 goto bad;
2233 }
2234
2235 rc = next_entry(policydb_str, fp, len);
2236 if (rc) {
2237 printk(KERN_ERR "SELinux: truncated policydb string identifier\n");
2238 kfree(policydb_str);
2239 goto bad;
2240 }
2241
2242 rc = -EINVAL;
2243 policydb_str[len] = '\0';
2244 if (strcmp(policydb_str, POLICYDB_STRING)) {
2245 printk(KERN_ERR "SELinux: policydb string %s does not match "
2246 "my string %s\n", policydb_str, POLICYDB_STRING);
2247 kfree(policydb_str);
2248 goto bad;
2249 }
2250 /* Done with policydb_str. */
2251 kfree(policydb_str);
2252 policydb_str = NULL;
2253
2254 /* Read the version and table sizes. */
2255 rc = next_entry(buf, fp, sizeof(u32)*4);
2256 if (rc)
2257 goto bad;
2258
2259 rc = -EINVAL;
2260 p->policyvers = le32_to_cpu(buf[0]);
2261 if (p->policyvers < POLICYDB_VERSION_MIN ||
2262 p->policyvers > POLICYDB_VERSION_MAX) {
2263 printk(KERN_ERR "SELinux: policydb version %d does not match "
2264 "my version range %d-%d\n",
2265 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2266 goto bad;
2267 }
2268
2269 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2270 p->mls_enabled = 1;
2271
2272 rc = -EINVAL;
2273 if (p->policyvers < POLICYDB_VERSION_MLS) {
2274 printk(KERN_ERR "SELinux: security policydb version %d "
2275 "(MLS) not backwards compatible\n",
2276 p->policyvers);
2277 goto bad;
2278 }
2279 }
2280 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2281 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2282
2283 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2284 rc = ebitmap_read(&p->policycaps, fp);
2285 if (rc)
2286 goto bad;
2287 }
2288
2289 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2290 rc = ebitmap_read(&p->permissive_map, fp);
2291 if (rc)
2292 goto bad;
2293 }
2294
2295 rc = -EINVAL;
2296 info = policydb_lookup_compat(p->policyvers);
2297 if (!info) {
2298 printk(KERN_ERR "SELinux: unable to find policy compat info "
2299 "for version %d\n", p->policyvers);
2300 goto bad;
2301 }
2302
2303 rc = -EINVAL;
2304 if (le32_to_cpu(buf[2]) != info->sym_num ||
2305 le32_to_cpu(buf[3]) != info->ocon_num) {
2306 printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do "
2307 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2308 le32_to_cpu(buf[3]),
2309 info->sym_num, info->ocon_num);
2310 goto bad;
2311 }
2312
2313 for (i = 0; i < info->sym_num; i++) {
2314 rc = next_entry(buf, fp, sizeof(u32)*2);
2315 if (rc)
2316 goto bad;
2317 nprim = le32_to_cpu(buf[0]);
2318 nel = le32_to_cpu(buf[1]);
2319 for (j = 0; j < nel; j++) {
2320 rc = read_f[i](p, p->symtab[i].table, fp);
2321 if (rc)
2322 goto bad;
2323 }
2324
2325 p->symtab[i].nprim = nprim;
2326 }
2327
2328 rc = -EINVAL;
2329 p->process_class = string_to_security_class(p, "process");
2330 if (!p->process_class)
2331 goto bad;
2332
2333 rc = avtab_read(&p->te_avtab, fp, p);
2334 if (rc)
2335 goto bad;
2336
2337 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2338 rc = cond_read_list(p, fp);
2339 if (rc)
2340 goto bad;
2341 }
2342
2343 rc = next_entry(buf, fp, sizeof(u32));
2344 if (rc)
2345 goto bad;
2346 nel = le32_to_cpu(buf[0]);
2347 ltr = NULL;
2348 for (i = 0; i < nel; i++) {
2349 rc = -ENOMEM;
2350 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2351 if (!tr)
2352 goto bad;
2353 if (ltr)
2354 ltr->next = tr;
2355 else
2356 p->role_tr = tr;
2357 rc = next_entry(buf, fp, sizeof(u32)*3);
2358 if (rc)
2359 goto bad;
2360
2361 rc = -EINVAL;
2362 tr->role = le32_to_cpu(buf[0]);
2363 tr->type = le32_to_cpu(buf[1]);
2364 tr->new_role = le32_to_cpu(buf[2]);
2365 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2366 rc = next_entry(buf, fp, sizeof(u32));
2367 if (rc)
2368 goto bad;
2369 tr->tclass = le32_to_cpu(buf[0]);
2370 } else
2371 tr->tclass = p->process_class;
2372
2373 if (!policydb_role_isvalid(p, tr->role) ||
2374 !policydb_type_isvalid(p, tr->type) ||
2375 !policydb_class_isvalid(p, tr->tclass) ||
2376 !policydb_role_isvalid(p, tr->new_role))
2377 goto bad;
2378 ltr = tr;
2379 }
2380
2381 rc = next_entry(buf, fp, sizeof(u32));
2382 if (rc)
2383 goto bad;
2384 nel = le32_to_cpu(buf[0]);
2385 lra = NULL;
2386 for (i = 0; i < nel; i++) {
2387 rc = -ENOMEM;
2388 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2389 if (!ra)
2390 goto bad;
2391 if (lra)
2392 lra->next = ra;
2393 else
2394 p->role_allow = ra;
2395 rc = next_entry(buf, fp, sizeof(u32)*2);
2396 if (rc)
2397 goto bad;
2398
2399 rc = -EINVAL;
2400 ra->role = le32_to_cpu(buf[0]);
2401 ra->new_role = le32_to_cpu(buf[1]);
2402 if (!policydb_role_isvalid(p, ra->role) ||
2403 !policydb_role_isvalid(p, ra->new_role))
2404 goto bad;
2405 lra = ra;
2406 }
2407
2408 rc = filename_trans_read(p, fp);
2409 if (rc)
2410 goto bad;
2411
2412 rc = policydb_index(p);
2413 if (rc)
2414 goto bad;
2415
2416 rc = -EINVAL;
2417 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2418 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2419 if (!p->process_trans_perms)
2420 goto bad;
2421
2422 rc = ocontext_read(p, info, fp);
2423 if (rc)
2424 goto bad;
2425
2426 rc = genfs_read(p, fp);
2427 if (rc)
2428 goto bad;
2429
2430 rc = range_read(p, fp);
2431 if (rc)
2432 goto bad;
2433
2434 rc = -ENOMEM;
2435 p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2436 p->p_types.nprim,
2437 GFP_KERNEL | __GFP_ZERO);
2438 if (!p->type_attr_map_array)
2439 goto bad;
2440
2441 /* preallocate so we don't have to worry about the put ever failing */
2442 rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2443 GFP_KERNEL | __GFP_ZERO);
2444 if (rc)
2445 goto bad;
2446
2447 for (i = 0; i < p->p_types.nprim; i++) {
2448 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2449
2450 BUG_ON(!e);
2451 ebitmap_init(e);
2452 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2453 rc = ebitmap_read(e, fp);
2454 if (rc)
2455 goto bad;
2456 }
2457 /* add the type itself as the degenerate case */
2458 rc = ebitmap_set_bit(e, i, 1);
2459 if (rc)
2460 goto bad;
2461 }
2462
2463 rc = policydb_bounds_sanity_check(p);
2464 if (rc)
2465 goto bad;
2466
2467 rc = 0;
2468 out:
2469 return rc;
2470 bad:
2471 policydb_destroy(p);
2472 goto out;
2473 }
2474
2475 /*
2476 * Write a MLS level structure to a policydb binary
2477 * representation file.
2478 */
2479 static int mls_write_level(struct mls_level *l, void *fp)
2480 {
2481 __le32 buf[1];
2482 int rc;
2483
2484 buf[0] = cpu_to_le32(l->sens);
2485 rc = put_entry(buf, sizeof(u32), 1, fp);
2486 if (rc)
2487 return rc;
2488
2489 rc = ebitmap_write(&l->cat, fp);
2490 if (rc)
2491 return rc;
2492
2493 return 0;
2494 }
2495
2496 /*
2497 * Write a MLS range structure to a policydb binary
2498 * representation file.
2499 */
2500 static int mls_write_range_helper(struct mls_range *r, void *fp)
2501 {
2502 __le32 buf[3];
2503 size_t items;
2504 int rc, eq;
2505
2506 eq = mls_level_eq(&r->level[1], &r->level[0]);
2507
2508 if (eq)
2509 items = 2;
2510 else
2511 items = 3;
2512 buf[0] = cpu_to_le32(items-1);
2513 buf[1] = cpu_to_le32(r->level[0].sens);
2514 if (!eq)
2515 buf[2] = cpu_to_le32(r->level[1].sens);
2516
2517 BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2518
2519 rc = put_entry(buf, sizeof(u32), items, fp);
2520 if (rc)
2521 return rc;
2522
2523 rc = ebitmap_write(&r->level[0].cat, fp);
2524 if (rc)
2525 return rc;
2526 if (!eq) {
2527 rc = ebitmap_write(&r->level[1].cat, fp);
2528 if (rc)
2529 return rc;
2530 }
2531
2532 return 0;
2533 }
2534
2535 static int sens_write(void *vkey, void *datum, void *ptr)
2536 {
2537 char *key = vkey;
2538 struct level_datum *levdatum = datum;
2539 struct policy_data *pd = ptr;
2540 void *fp = pd->fp;
2541 __le32 buf[2];
2542 size_t len;
2543 int rc;
2544
2545 len = strlen(key);
2546 buf[0] = cpu_to_le32(len);
2547 buf[1] = cpu_to_le32(levdatum->isalias);
2548 rc = put_entry(buf, sizeof(u32), 2, fp);
2549 if (rc)
2550 return rc;
2551
2552 rc = put_entry(key, 1, len, fp);
2553 if (rc)
2554 return rc;
2555
2556 rc = mls_write_level(levdatum->level, fp);
2557 if (rc)
2558 return rc;
2559
2560 return 0;
2561 }
2562
2563 static int cat_write(void *vkey, void *datum, void *ptr)
2564 {
2565 char *key = vkey;
2566 struct cat_datum *catdatum = datum;
2567 struct policy_data *pd = ptr;
2568 void *fp = pd->fp;
2569 __le32 buf[3];
2570 size_t len;
2571 int rc;
2572
2573 len = strlen(key);
2574 buf[0] = cpu_to_le32(len);
2575 buf[1] = cpu_to_le32(catdatum->value);
2576 buf[2] = cpu_to_le32(catdatum->isalias);
2577 rc = put_entry(buf, sizeof(u32), 3, fp);
2578 if (rc)
2579 return rc;
2580
2581 rc = put_entry(key, 1, len, fp);
2582 if (rc)
2583 return rc;
2584
2585 return 0;
2586 }
2587
2588 static int role_trans_write(struct policydb *p, void *fp)
2589 {
2590 struct role_trans *r = p->role_tr;
2591 struct role_trans *tr;
2592 u32 buf[3];
2593 size_t nel;
2594 int rc;
2595
2596 nel = 0;
2597 for (tr = r; tr; tr = tr->next)
2598 nel++;
2599 buf[0] = cpu_to_le32(nel);
2600 rc = put_entry(buf, sizeof(u32), 1, fp);
2601 if (rc)
2602 return rc;
2603 for (tr = r; tr; tr = tr->next) {
2604 buf[0] = cpu_to_le32(tr->role);
2605 buf[1] = cpu_to_le32(tr->type);
2606 buf[2] = cpu_to_le32(tr->new_role);
2607 rc = put_entry(buf, sizeof(u32), 3, fp);
2608 if (rc)
2609 return rc;
2610 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2611 buf[0] = cpu_to_le32(tr->tclass);
2612 rc = put_entry(buf, sizeof(u32), 1, fp);
2613 if (rc)
2614 return rc;
2615 }
2616 }
2617
2618 return 0;
2619 }
2620
2621 static int role_allow_write(struct role_allow *r, void *fp)
2622 {
2623 struct role_allow *ra;
2624 u32 buf[2];
2625 size_t nel;
2626 int rc;
2627
2628 nel = 0;
2629 for (ra = r; ra; ra = ra->next)
2630 nel++;
2631 buf[0] = cpu_to_le32(nel);
2632 rc = put_entry(buf, sizeof(u32), 1, fp);
2633 if (rc)
2634 return rc;
2635 for (ra = r; ra; ra = ra->next) {
2636 buf[0] = cpu_to_le32(ra->role);
2637 buf[1] = cpu_to_le32(ra->new_role);
2638 rc = put_entry(buf, sizeof(u32), 2, fp);
2639 if (rc)
2640 return rc;
2641 }
2642 return 0;
2643 }
2644
2645 /*
2646 * Write a security context structure
2647 * to a policydb binary representation file.
2648 */
2649 static int context_write(struct policydb *p, struct context *c,
2650 void *fp)
2651 {
2652 int rc;
2653 __le32 buf[3];
2654
2655 buf[0] = cpu_to_le32(c->user);
2656 buf[1] = cpu_to_le32(c->role);
2657 buf[2] = cpu_to_le32(c->type);
2658
2659 rc = put_entry(buf, sizeof(u32), 3, fp);
2660 if (rc)
2661 return rc;
2662
2663 rc = mls_write_range_helper(&c->range, fp);
2664 if (rc)
2665 return rc;
2666
2667 return 0;
2668 }
2669
2670 /*
2671 * The following *_write functions are used to
2672 * write the symbol data to a policy database
2673 * binary representation file.
2674 */
2675
2676 static int perm_write(void *vkey, void *datum, void *fp)
2677 {
2678 char *key = vkey;
2679 struct perm_datum *perdatum = datum;
2680 __le32 buf[2];
2681 size_t len;
2682 int rc;
2683
2684 len = strlen(key);
2685 buf[0] = cpu_to_le32(len);
2686 buf[1] = cpu_to_le32(perdatum->value);
2687 rc = put_entry(buf, sizeof(u32), 2, fp);
2688 if (rc)
2689 return rc;
2690
2691 rc = put_entry(key, 1, len, fp);
2692 if (rc)
2693 return rc;
2694
2695 return 0;
2696 }
2697
2698 static int common_write(void *vkey, void *datum, void *ptr)
2699 {
2700 char *key = vkey;
2701 struct common_datum *comdatum = datum;
2702 struct policy_data *pd = ptr;
2703 void *fp = pd->fp;
2704 __le32 buf[4];
2705 size_t len;
2706 int rc;
2707
2708 len = strlen(key);
2709 buf[0] = cpu_to_le32(len);
2710 buf[1] = cpu_to_le32(comdatum->value);
2711 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2712 buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2713 rc = put_entry(buf, sizeof(u32), 4, fp);
2714 if (rc)
2715 return rc;
2716
2717 rc = put_entry(key, 1, len, fp);
2718 if (rc)
2719 return rc;
2720
2721 rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2722 if (rc)
2723 return rc;
2724
2725 return 0;
2726 }
2727
2728 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2729 void *fp)
2730 {
2731 struct constraint_node *c;
2732 struct constraint_expr *e;
2733 __le32 buf[3];
2734 u32 nel;
2735 int rc;
2736
2737 for (c = node; c; c = c->next) {
2738 nel = 0;
2739 for (e = c->expr; e; e = e->next)
2740 nel++;
2741 buf[0] = cpu_to_le32(c->permissions);
2742 buf[1] = cpu_to_le32(nel);
2743 rc = put_entry(buf, sizeof(u32), 2, fp);
2744 if (rc)
2745 return rc;
2746 for (e = c->expr; e; e = e->next) {
2747 buf[0] = cpu_to_le32(e->expr_type);
2748 buf[1] = cpu_to_le32(e->attr);
2749 buf[2] = cpu_to_le32(e->op);
2750 rc = put_entry(buf, sizeof(u32), 3, fp);
2751 if (rc)
2752 return rc;
2753
2754 switch (e->expr_type) {
2755 case CEXPR_NAMES:
2756 rc = ebitmap_write(&e->names, fp);
2757 if (rc)
2758 return rc;
2759 break;
2760 default:
2761 break;
2762 }
2763 }
2764 }
2765
2766 return 0;
2767 }
2768
2769 static int class_write(void *vkey, void *datum, void *ptr)
2770 {
2771 char *key = vkey;
2772 struct class_datum *cladatum = datum;
2773 struct policy_data *pd = ptr;
2774 void *fp = pd->fp;
2775 struct policydb *p = pd->p;
2776 struct constraint_node *c;
2777 __le32 buf[6];
2778 u32 ncons;
2779 size_t len, len2;
2780 int rc;
2781
2782 len = strlen(key);
2783 if (cladatum->comkey)
2784 len2 = strlen(cladatum->comkey);
2785 else
2786 len2 = 0;
2787
2788 ncons = 0;
2789 for (c = cladatum->constraints; c; c = c->next)
2790 ncons++;
2791
2792 buf[0] = cpu_to_le32(len);
2793 buf[1] = cpu_to_le32(len2);
2794 buf[2] = cpu_to_le32(cladatum->value);
2795 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2796 if (cladatum->permissions.table)
2797 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2798 else
2799 buf[4] = 0;
2800 buf[5] = cpu_to_le32(ncons);
2801 rc = put_entry(buf, sizeof(u32), 6, fp);
2802 if (rc)
2803 return rc;
2804
2805 rc = put_entry(key, 1, len, fp);
2806 if (rc)
2807 return rc;
2808
2809 if (cladatum->comkey) {
2810 rc = put_entry(cladatum->comkey, 1, len2, fp);
2811 if (rc)
2812 return rc;
2813 }
2814
2815 rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2816 if (rc)
2817 return rc;
2818
2819 rc = write_cons_helper(p, cladatum->constraints, fp);
2820 if (rc)
2821 return rc;
2822
2823 /* write out the validatetrans rule */
2824 ncons = 0;
2825 for (c = cladatum->validatetrans; c; c = c->next)
2826 ncons++;
2827
2828 buf[0] = cpu_to_le32(ncons);
2829 rc = put_entry(buf, sizeof(u32), 1, fp);
2830 if (rc)
2831 return rc;
2832
2833 rc = write_cons_helper(p, cladatum->validatetrans, fp);
2834 if (rc)
2835 return rc;
2836
2837 return 0;
2838 }
2839
2840 static int role_write(void *vkey, void *datum, void *ptr)
2841 {
2842 char *key = vkey;
2843 struct role_datum *role = datum;
2844 struct policy_data *pd = ptr;
2845 void *fp = pd->fp;
2846 struct policydb *p = pd->p;
2847 __le32 buf[3];
2848 size_t items, len;
2849 int rc;
2850
2851 len = strlen(key);
2852 items = 0;
2853 buf[items++] = cpu_to_le32(len);
2854 buf[items++] = cpu_to_le32(role->value);
2855 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2856 buf[items++] = cpu_to_le32(role->bounds);
2857
2858 BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2859
2860 rc = put_entry(buf, sizeof(u32), items, fp);
2861 if (rc)
2862 return rc;
2863
2864 rc = put_entry(key, 1, len, fp);
2865 if (rc)
2866 return rc;
2867
2868 rc = ebitmap_write(&role->dominates, fp);
2869 if (rc)
2870 return rc;
2871
2872 rc = ebitmap_write(&role->types, fp);
2873 if (rc)
2874 return rc;
2875
2876 return 0;
2877 }
2878
2879 static int type_write(void *vkey, void *datum, void *ptr)
2880 {
2881 char *key = vkey;
2882 struct type_datum *typdatum = datum;
2883 struct policy_data *pd = ptr;
2884 struct policydb *p = pd->p;
2885 void *fp = pd->fp;
2886 __le32 buf[4];
2887 int rc;
2888 size_t items, len;
2889
2890 len = strlen(key);
2891 items = 0;
2892 buf[items++] = cpu_to_le32(len);
2893 buf[items++] = cpu_to_le32(typdatum->value);
2894 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2895 u32 properties = 0;
2896
2897 if (typdatum->primary)
2898 properties |= TYPEDATUM_PROPERTY_PRIMARY;
2899
2900 if (typdatum->attribute)
2901 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2902
2903 buf[items++] = cpu_to_le32(properties);
2904 buf[items++] = cpu_to_le32(typdatum->bounds);
2905 } else {
2906 buf[items++] = cpu_to_le32(typdatum->primary);
2907 }
2908 BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2909 rc = put_entry(buf, sizeof(u32), items, fp);
2910 if (rc)
2911 return rc;
2912
2913 rc = put_entry(key, 1, len, fp);
2914 if (rc)
2915 return rc;
2916
2917 return 0;
2918 }
2919
2920 static int user_write(void *vkey, void *datum, void *ptr)
2921 {
2922 char *key = vkey;
2923 struct user_datum *usrdatum = datum;
2924 struct policy_data *pd = ptr;
2925 struct policydb *p = pd->p;
2926 void *fp = pd->fp;
2927 __le32 buf[3];
2928 size_t items, len;
2929 int rc;
2930
2931 len = strlen(key);
2932 items = 0;
2933 buf[items++] = cpu_to_le32(len);
2934 buf[items++] = cpu_to_le32(usrdatum->value);
2935 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2936 buf[items++] = cpu_to_le32(usrdatum->bounds);
2937 BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2938 rc = put_entry(buf, sizeof(u32), items, fp);
2939 if (rc)
2940 return rc;
2941
2942 rc = put_entry(key, 1, len, fp);
2943 if (rc)
2944 return rc;
2945
2946 rc = ebitmap_write(&usrdatum->roles, fp);
2947 if (rc)
2948 return rc;
2949
2950 rc = mls_write_range_helper(&usrdatum->range, fp);
2951 if (rc)
2952 return rc;
2953
2954 rc = mls_write_level(&usrdatum->dfltlevel, fp);
2955 if (rc)
2956 return rc;
2957
2958 return 0;
2959 }
2960
2961 static int (*write_f[SYM_NUM]) (void *key, void *datum,
2962 void *datap) =
2963 {
2964 common_write,
2965 class_write,
2966 role_write,
2967 type_write,
2968 user_write,
2969 cond_write_bool,
2970 sens_write,
2971 cat_write,
2972 };
2973
2974 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
2975 void *fp)
2976 {
2977 unsigned int i, j, rc;
2978 size_t nel, len;
2979 __le32 buf[3];
2980 u32 nodebuf[8];
2981 struct ocontext *c;
2982 for (i = 0; i < info->ocon_num; i++) {
2983 nel = 0;
2984 for (c = p->ocontexts[i]; c; c = c->next)
2985 nel++;
2986 buf[0] = cpu_to_le32(nel);
2987 rc = put_entry(buf, sizeof(u32), 1, fp);
2988 if (rc)
2989 return rc;
2990 for (c = p->ocontexts[i]; c; c = c->next) {
2991 switch (i) {
2992 case OCON_ISID:
2993 buf[0] = cpu_to_le32(c->sid[0]);
2994 rc = put_entry(buf, sizeof(u32), 1, fp);
2995 if (rc)
2996 return rc;
2997 rc = context_write(p, &c->context[0], fp);
2998 if (rc)
2999 return rc;
3000 break;
3001 case OCON_FS:
3002 case OCON_NETIF:
3003 len = strlen(c->u.name);
3004 buf[0] = cpu_to_le32(len);
3005 rc = put_entry(buf, sizeof(u32), 1, fp);
3006 if (rc)
3007 return rc;
3008 rc = put_entry(c->u.name, 1, len, fp);
3009 if (rc)
3010 return rc;
3011 rc = context_write(p, &c->context[0], fp);
3012 if (rc)
3013 return rc;
3014 rc = context_write(p, &c->context[1], fp);
3015 if (rc)
3016 return rc;
3017 break;
3018 case OCON_PORT:
3019 buf[0] = cpu_to_le32(c->u.port.protocol);
3020 buf[1] = cpu_to_le32(c->u.port.low_port);
3021 buf[2] = cpu_to_le32(c->u.port.high_port);
3022 rc = put_entry(buf, sizeof(u32), 3, fp);
3023 if (rc)
3024 return rc;
3025 rc = context_write(p, &c->context[0], fp);
3026 if (rc)
3027 return rc;
3028 break;
3029 case OCON_NODE:
3030 nodebuf[0] = c->u.node.addr; /* network order */
3031 nodebuf[1] = c->u.node.mask; /* network order */
3032 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3033 if (rc)
3034 return rc;
3035 rc = context_write(p, &c->context[0], fp);
3036 if (rc)
3037 return rc;
3038 break;
3039 case OCON_FSUSE:
3040 buf[0] = cpu_to_le32(c->v.behavior);
3041 len = strlen(c->u.name);
3042 buf[1] = cpu_to_le32(len);
3043 rc = put_entry(buf, sizeof(u32), 2, fp);
3044 if (rc)
3045 return rc;
3046 rc = put_entry(c->u.name, 1, len, fp);
3047 if (rc)
3048 return rc;
3049 rc = context_write(p, &c->context[0], fp);
3050 if (rc)
3051 return rc;
3052 break;
3053 case OCON_NODE6:
3054 for (j = 0; j < 4; j++)
3055 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3056 for (j = 0; j < 4; j++)
3057 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3058 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3059 if (rc)
3060 return rc;
3061 rc = context_write(p, &c->context[0], fp);
3062 if (rc)
3063 return rc;
3064 break;
3065 }
3066 }
3067 }
3068 return 0;
3069 }
3070
3071 static int genfs_write(struct policydb *p, void *fp)
3072 {
3073 struct genfs *genfs;
3074 struct ocontext *c;
3075 size_t len;
3076 __le32 buf[1];
3077 int rc;
3078
3079 len = 0;
3080 for (genfs = p->genfs; genfs; genfs = genfs->next)
3081 len++;
3082 buf[0] = cpu_to_le32(len);
3083 rc = put_entry(buf, sizeof(u32), 1, fp);
3084 if (rc)
3085 return rc;
3086 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3087 len = strlen(genfs->fstype);
3088 buf[0] = cpu_to_le32(len);
3089 rc = put_entry(buf, sizeof(u32), 1, fp);
3090 if (rc)
3091 return rc;
3092 rc = put_entry(genfs->fstype, 1, len, fp);
3093 if (rc)
3094 return rc;
3095 len = 0;
3096 for (c = genfs->head; c; c = c->next)
3097 len++;
3098 buf[0] = cpu_to_le32(len);
3099 rc = put_entry(buf, sizeof(u32), 1, fp);
3100 if (rc)
3101 return rc;
3102 for (c = genfs->head; c; c = c->next) {
3103 len = strlen(c->u.name);
3104 buf[0] = cpu_to_le32(len);
3105 rc = put_entry(buf, sizeof(u32), 1, fp);
3106 if (rc)
3107 return rc;
3108 rc = put_entry(c->u.name, 1, len, fp);
3109 if (rc)
3110 return rc;
3111 buf[0] = cpu_to_le32(c->v.sclass);
3112 rc = put_entry(buf, sizeof(u32), 1, fp);
3113 if (rc)
3114 return rc;
3115 rc = context_write(p, &c->context[0], fp);
3116 if (rc)
3117 return rc;
3118 }
3119 }
3120 return 0;
3121 }
3122
3123 static int hashtab_cnt(void *key, void *data, void *ptr)
3124 {
3125 int *cnt = ptr;
3126 *cnt = *cnt + 1;
3127
3128 return 0;
3129 }
3130
3131 static int range_write_helper(void *key, void *data, void *ptr)
3132 {
3133 __le32 buf[2];
3134 struct range_trans *rt = key;
3135 struct mls_range *r = data;
3136 struct policy_data *pd = ptr;
3137 void *fp = pd->fp;
3138 struct policydb *p = pd->p;
3139 int rc;
3140
3141 buf[0] = cpu_to_le32(rt->source_type);
3142 buf[1] = cpu_to_le32(rt->target_type);
3143 rc = put_entry(buf, sizeof(u32), 2, fp);
3144 if (rc)
3145 return rc;
3146 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3147 buf[0] = cpu_to_le32(rt->target_class);
3148 rc = put_entry(buf, sizeof(u32), 1, fp);
3149 if (rc)
3150 return rc;
3151 }
3152 rc = mls_write_range_helper(r, fp);
3153 if (rc)
3154 return rc;
3155
3156 return 0;
3157 }
3158
3159 static int range_write(struct policydb *p, void *fp)
3160 {
3161 size_t nel;
3162 __le32 buf[1];
3163 int rc;
3164 struct policy_data pd;
3165
3166 pd.p = p;
3167 pd.fp = fp;
3168
3169 /* count the number of entries in the hashtab */
3170 nel = 0;
3171 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3172 if (rc)
3173 return rc;
3174
3175 buf[0] = cpu_to_le32(nel);
3176 rc = put_entry(buf, sizeof(u32), 1, fp);
3177 if (rc)
3178 return rc;
3179
3180 /* actually write all of the entries */
3181 rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3182 if (rc)
3183 return rc;
3184
3185 return 0;
3186 }
3187
3188 static int filename_write_helper(void *key, void *data, void *ptr)
3189 {
3190 __le32 buf[4];
3191 struct filename_trans *ft = key;
3192 struct filename_trans_datum *otype = data;
3193 void *fp = ptr;
3194 int rc;
3195 u32 len;
3196
3197 len = strlen(ft->name);
3198 buf[0] = cpu_to_le32(len);
3199 rc = put_entry(buf, sizeof(u32), 1, fp);
3200 if (rc)
3201 return rc;
3202
3203 rc = put_entry(ft->name, sizeof(char), len, fp);
3204 if (rc)
3205 return rc;
3206
3207 buf[0] = ft->stype;
3208 buf[1] = ft->ttype;
3209 buf[2] = ft->tclass;
3210 buf[3] = otype->otype;
3211
3212 rc = put_entry(buf, sizeof(u32), 4, fp);
3213 if (rc)
3214 return rc;
3215
3216 return 0;
3217 }
3218
3219 static int filename_trans_write(struct policydb *p, void *fp)
3220 {
3221 u32 nel;
3222 __le32 buf[1];
3223 int rc;
3224
3225 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3226 return 0;
3227
3228 nel = 0;
3229 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3230 if (rc)
3231 return rc;
3232
3233 buf[0] = cpu_to_le32(nel);
3234 rc = put_entry(buf, sizeof(u32), 1, fp);
3235 if (rc)
3236 return rc;
3237
3238 rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3239 if (rc)
3240 return rc;
3241
3242 return 0;
3243 }
3244
3245 /*
3246 * Write the configuration data in a policy database
3247 * structure to a policy database binary representation
3248 * file.
3249 */
3250 int policydb_write(struct policydb *p, void *fp)
3251 {
3252 unsigned int i, num_syms;
3253 int rc;
3254 __le32 buf[4];
3255 u32 config;
3256 size_t len;
3257 struct policydb_compat_info *info;
3258
3259 /*
3260 * refuse to write policy older than compressed avtab
3261 * to simplify the writer. There are other tests dropped
3262 * since we assume this throughout the writer code. Be
3263 * careful if you ever try to remove this restriction
3264 */
3265 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3266 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3267 " Because it is less than version %d\n", p->policyvers,
3268 POLICYDB_VERSION_AVTAB);
3269 return -EINVAL;
3270 }
3271
3272 config = 0;
3273 if (p->mls_enabled)
3274 config |= POLICYDB_CONFIG_MLS;
3275
3276 if (p->reject_unknown)
3277 config |= REJECT_UNKNOWN;
3278 if (p->allow_unknown)
3279 config |= ALLOW_UNKNOWN;
3280
3281 /* Write the magic number and string identifiers. */
3282 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3283 len = strlen(POLICYDB_STRING);
3284 buf[1] = cpu_to_le32(len);
3285 rc = put_entry(buf, sizeof(u32), 2, fp);
3286 if (rc)
3287 return rc;
3288 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3289 if (rc)
3290 return rc;
3291
3292 /* Write the version, config, and table sizes. */
3293 info = policydb_lookup_compat(p->policyvers);
3294 if (!info) {
3295 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3296 "version %d", p->policyvers);
3297 return -EINVAL;
3298 }
3299
3300 buf[0] = cpu_to_le32(p->policyvers);
3301 buf[1] = cpu_to_le32(config);
3302 buf[2] = cpu_to_le32(info->sym_num);
3303 buf[3] = cpu_to_le32(info->ocon_num);
3304
3305 rc = put_entry(buf, sizeof(u32), 4, fp);
3306 if (rc)
3307 return rc;
3308
3309 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3310 rc = ebitmap_write(&p->policycaps, fp);
3311 if (rc)
3312 return rc;
3313 }
3314
3315 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3316 rc = ebitmap_write(&p->permissive_map, fp);
3317 if (rc)
3318 return rc;
3319 }
3320
3321 num_syms = info->sym_num;
3322 for (i = 0; i < num_syms; i++) {
3323 struct policy_data pd;
3324
3325 pd.fp = fp;
3326 pd.p = p;
3327
3328 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3329 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3330
3331 rc = put_entry(buf, sizeof(u32), 2, fp);
3332 if (rc)
3333 return rc;
3334 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3335 if (rc)
3336 return rc;
3337 }
3338
3339 rc = avtab_write(p, &p->te_avtab, fp);
3340 if (rc)
3341 return rc;
3342
3343 rc = cond_write_list(p, p->cond_list, fp);
3344 if (rc)
3345 return rc;
3346
3347 rc = role_trans_write(p, fp);
3348 if (rc)
3349 return rc;
3350
3351 rc = role_allow_write(p->role_allow, fp);
3352 if (rc)
3353 return rc;
3354
3355 rc = filename_trans_write(p, fp);
3356 if (rc)
3357 return rc;
3358
3359 rc = ocontext_write(p, info, fp);
3360 if (rc)
3361 return rc;
3362
3363 rc = genfs_write(p, fp);
3364 if (rc)
3365 return rc;
3366
3367 rc = range_write(p, fp);
3368 if (rc)
3369 return rc;
3370
3371 for (i = 0; i < p->p_types.nprim; i++) {
3372 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3373
3374 BUG_ON(!e);
3375 rc = ebitmap_write(e, fp);
3376 if (rc)
3377 return rc;
3378 }
3379
3380 return 0;
3381 }